Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Best Practices Guide for Department of Defense Cloud Mission Owners Version 1 0 Aug 2015 Last updated 2015-08-06 Developed by the Defense Information Systems Agency DISA For the Department of Defense DoD IMPORTANT This Guide includes examples of specific products and vendor offerings These examples are provided only as lessons learned and are NOT intended as recommendations New versions of this Guide may include additional or different examples - no conclusions should be made about changes DISA does not endorse or recommend any specific product or vendor DISTRIBUTION A Approved for public release distribution unlimited 1 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Cloud computing plays a critical role in the Department's IT modernization efforts Our key objective is to deliver a cost efficient secure enough enterprise environment the security driven by the data that can readily adapt to the Department's mission needs The Cloud will support the Department's JIE with a robust IT capability built on an integrated set of Cloud services provided by both commercial providers and DoD Components We will use a hybrid approach to Cloud that takes advantage of all types of Cloud solutions to get the best combination of mission effectiveness and efficiency This means in some cases we will use a purely commercial solution which we have done with Amazon on public facing data in others we will use a modified private Cloud hosted in commercial solutions an example could be a shared federal or federal state government Cloud and for our most protected data a DoD private Cloud that uses best industry practices - Mr Terry Halvorsen DoD Chief Information Officer statement to the House Armed Services Committee Subcommittee On Emerging Threats Capabilities 25 Feb 15 2 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Note This Best Practices Guide BPG is NOT DoD Policy DISA Policy a Security Requirements Guide SRG or a Security Technical Implementation Guide STIG It is a collection of Best Practices discovered during the DoD CIO Cloud Pilots effort for the benefit of the DoD Community The DoD Cloud Computing Security Requirements Guide is located at http iase disa mil Cloud_security Pages index aspx Compliance with the SRG is a requirement for all Cloud solutions including commercial and government provided offerings Trademark Information Names products and services referenced within this document may be the trade names trademarks or service marks of their respective owners References to commercial vendors and their products or services are provided strictly as a convenience to our users and do not constitute or imply endorsement by DoD DISA or DISA Risk Management Executive of any non-Federal entity event product service or enterprise 3 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Table of Contents 1 Introduction 5 2 Initial Steps 6 3 Understanding the Shared Responsibility Model in Cloud Computing 9 4 Assessment and Authorization 10 5 IP Standards 11 6 Domain Name Service DNS 13 7 Cloud Email 13 8 Storage Capacity Partitions and Backups 14 9 Achieving High Availability 18 10 Bastion Host 20 11 Useful Tips Lessons Learned 21 Appendix A Terminology 22 4 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 1 Introduction Per the direction of the Department of Defense DoD Chief Information Officer CIO DoD examined the use of commercial cloud computing as a cost savings measure and for efficiencies in delivering highly available and scalable capabilities in support of the Warfighter A 45-day study was commissioned to examine the balance between risks to the Department across the wide spectrum of computing needs and the costs of traditional security measures The results of the study were twofold 1 it produced the document called the DoD Cloud Way Forward and 2 it was the catalyst for the DoD CIO Cloud Pilots initiative This Best Practices Guide BPG document is a collection of knowledge and experiences gained from the DoD CIO Cloud Pilots initiative in particular DISA's Information Assurance Support Environment IASE and U S Army's DoD Environment Safety and Occupational Health Network and Information Exchange DENIX This BPG is targeted towards DoD Mission Owners who are planning to migrate an existing information system from a physical environment to a virtualized cloud environment Note The Cloud Computing Security Requirements Guide SRG referenced throughout this BPG is located here http iase disa mil Cloud_security Pages index aspx Mission Owners must comply with the requirements of the SRG for any commercial cloud environment including government and commercial hosted cloud services 5 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 2 Initial Steps Go to the cloud services support portal at the following link http disa mil Computing Cloud-Services Cloud-Support Click on the tab How to Order Click on the Cloud service request form highlighted in the text This will navigate to the Cloud Services Site At the top there is a link to the Service Catalog Mission Owner can use this link to check which Cloud Service Offerings CSOs have been granted Provisional Authorizations PA In addition there is a link to the PA which contains specific information about the CSO Next the Mission Owner should evaluate the mission requirements versus the capabilities in the approved service offerings for goodness of fit Additionally the Mission Owner must consider the desired scalability requirements Mission Owners have more control over compute than bandwidth Most Cloud Service Providers CSPs employ metered compute and bandwidth Compute can be further divided into processor memory and storage o Processor In a cloud based environment the processing capability is provisioned across virtual CPUs These vCPUs are hyper-threaded and are not mapped to a distinct physical core In essence the vCPUs are slotted on logical 6 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 o o DISA Risk Management Executive Developed by DISA for DoD processors and the physical core acts a scheduler of vCPUs' threads It is important to note that increasing the number of vCPUs does not always equate to an upsurge in performance since the scheduler has to coordinate all the actions of the vCPUs Therefore if a workload requires 8 vCPUs it may be more suitable to break the workload across two 4 vCPUs VMs or four 2 vCPUs VMs via a load balancer Memory Virtual Memory is measured in GBs Monitoring usage is easy and if the utilization approaches 90% of the available memory for 80% of the time it is time to increase the memory Storage This by far is the least expensive component of the Cloud To answer the question How much storage do I need please refer to the Capacity section below Understanding the Impact Levels of the data as detailed in the DoD Cloud Computing SRG is critical It is highly recommended that Mission Owners review and understand the SRG as well as the associated security controls attributed to each Impact Level After researching the different types of Cloud options and determining the best CSO it is important to discuss the effort with the AO thoroughly Last for easy reference Table 1 below provides an Impact Level comparison regarding key security control requirements and Table 2 provides a notional division of security risk between CSP and Mission Owner based on type of service being acquired 7 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Table 1 Impact Level Comparison Source DoD Cloud Computing SRG Table 2 Notional Division of Security Inheritance and Risk Source DoD Cloud Computing SRG 8 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 3 Understanding the Shared Responsibility Model in Cloud Computing In migrating workloads to the Cloud the CSP will provide compute bandwidth and storage capabilities It is important to note that the CSP will provide security mechanisms but the Mission Owner is responsible for activating deploying and managing the ones listed in Table 2 as you manage The Mission Owner is also responsible for including security requirements in the Request for Proposals contract and relevant Task Orders For commercial Infrastructure as a Service IaaS offerings for example the Mission Owner is responsible for the security of the following components o o o o o o o o o Virtual Machine Operating systems Applications Data in transit Data at rest Databases Credentials to include Private Keys Adhering to DoD Policies and configurations i e STIGs Vulnerability Compliance Reporting For all workloads as a result of recent OMB directive M-15-13 1 released 8 June 2015 the directive requires all publicly accessible Federal websites and web services only provide service through a secure connection Last the Mission Owner is required to encrypt the data in transit utilizing FIPS 140-2 compliant encryption IAW with the Application Security and Development STIG V-6136 TIP Create a table spreadsheet that lists the responsible organizations individuals and their specific responsibilities 1 https www whitehouse gov sites default files omb memoranda 2015 m-15-13 pdf 9 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 4 Assessment and Authorization The Mission Owner MUST STIG the servers in the Cloud virtual environment The Mission Owner MUST deploy Host Based Security to the virtual machines unless the capabilities are provided by the CSP as part of a Software as a Service SaaS offering The Mission Owner MUST patch the virtual machines to include the Information Assurance Vulnerability Management IAVM bulletins The Mission Owner MUST get an Interim Authority to Operate IATO or Authority to Operate ATO for mission information systems hosted in the Cloud The Provisional Authorization is specific to the CSO and is leveraged by the mission Authorizing Official AO as part of the risk decision process For the most part the same process that is used to accredit a system that is hosted in a DoD Data Center is followed when accrediting the virtual environment DoD has moved from the DoD Information Assurance Certification and Accreditation Process DIACAP to DoD Risk Management Framework RMF 2 It is recommended that the Mission Owner coordinate with the Information System Security Manager ISSM and seek guidance from his or her Authorizing Official AO in determining what is needed to assess and accredit the system The following are typical artifacts that should be captured and built as part of standing up the environment o Network Architecture Diagram showing the virtual servers the virtual enclaves the subnets IPs and how they are connected Software Listing Site Security Plan approved by the ISSM Security Content Automation Protocol SCAP Benchmark Scores Vulnerability Compliance Report o o o o 2 http www dtic mil whs directives corres pdf 851001_2014 pdf 10 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 5 IP Standards To determine the appropriate IP requirements it is helpful to be familiar with the Classless Inter-domain Routing CIDR Block system The CIDR is a set of IP standards that are used to create unique identifiers for networks and individual devices The IP addresses allow particular information packets to be routed to specific devices such as VMs An abbreviated CIDR block table 3 is provided below IP CIDR to last IP addr Mask Hosts Class a b c d 32 0 0 0 0 255 255 255 255 1 1 256 C a b c d 31 0 0 0 1 255 255 255 254 2 1 128 C a b c d 30 0 0 0 3 255 255 255 252 4 1 64 C a b c d 29 0 0 0 7 255 255 255 248 8 1 32 C a b c d 28 0 0 0 15 255 255 255 240 16 1 16 C a b c d 27 0 0 0 31 255 255 255 224 32 1 8 C a b c d 26 0 0 0 63 255 255 255 192 64 1 4 C a b c d 25 0 0 0 127 255 255 255 128 128 1 2 C a b c 0 24 0 0 0 255 255 255 255 000 256 1C a b c 0 23 0 0 1 255 255 255 254 000 512 2C a b c 0 22 0 0 3 255 255 255 252 000 1 024 4C a b 0 0 16 0 0 255 255 255 255 000 000 65 536 256 C 1 B a 0 0 0 8 0 255 255 255 255 000 000 000 16 777 216 256 B 1 A For routed subnets bigger than 31 or 32 two reserved addresses need to be subtracted from the number of available host addresses the largest address which is used as the broadcast address and the smallest address which is used to identify the network itself In addition any border router of a subnet typically uses a dedicated address Table 3 CIDR Block Table For Impact Levels 4 and 5 the Mission Owner will need to request DoD IP space from the DoD Network Information Center NIC https www nic mil The example on the next page pertains to IaaS Impact Levels 4 and 5 Impact Level 2 environments will use IPs from the CSO's IP space 3 http whatismyipaddress com cidr 11 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Let's walk through an example to determine how many IPs the Mission Owner might need For this example let's assume a Mission Owner is setting up 7 servers in the Cloud 1 2 3 4 5 6 7 Primary Active Directory Secondary Active Directory Web Server A Web Server B Database Server File Server Bastion Host more on this in next section Mission Owner might assume they need 7 IPs But that would not be enough Let's look for compliance with the Web Server STIG in particular placing the Web Server in a separate subnet of other assets V-2242 The Mission Owner will want to create at least two Subnets labeled as public and private Each CSO will have minimum CIDR block limits for creating subnets For example AWS Virtual Private Cloud VPC has a minimum CIDR block limit of 28 4 and the block limit for Microsoft Azure Virtual Network VN is 29 5 So if the Mission Owner used AWS VPC the block limit would be 28 which is 16 IPs For two subnets that is 32 IPs Remember that for each subnet two IPs are reserved for broadcast and identity resulting in 28 IPs In a second example with Azure VN the block limit is 29 which is 8 IPs For two subnets that is 16 IPs Again remember that for each subnet two IPs are reserved for broadcast and identity and Azure reserves two IPs for its services per subnet resulting in 8 IPs It is important to note to that the Mission Owner must look beyond just the VMs in determining how many IPs are needed Since the Mission Owner is creating the enclave in IaaS offering and as such establishing the subnets he or she must also think about growth Last the Mission Owner should consider the IPs required in deploying security devices such as an Assured Compliance Assessment Solution ACAS 6 Scanner If so additional IPs may be required TIP When constructing a virtual enclave please take the time to properly label all items in particular the subnets that are private or public This will help others to know what was done as well as assist in creating a network diagram 4 http docs aws amazon com AWSEC2 latest APIReference API_CreateSubnet html https msdn microsoft com en-us library azure jj156074 aspx 6 http www disa mil Cybersecurity Network-Defense ACAS 5 12 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 6 Domain Name Service DNS Once a Cloud Mission Owner acquires IP space it is time to plan for DNS The Cloud IPs may not be in the same address space as the Mission Owner's DNS provider Therefore the Mission Owner needs to discuss with the CSP how to obtain and manage both the A records forward lookup and PTR reverse pointer or reverse DNS records as needed The A record forward lookup maps a domain name to an IP address The PTR does the opposite by mapping the IP address back to the domain name PTR records are used to confirm the server at the originating IP is legitimate and approved Most importantly a PTR record is required to send email from your cloud application to the internet The A record should be provided upon request from the DNS provider TIP Recommend coordination with your DNS provider in the planning phase of the cloud project 7 Email from Cloud Mission Space If the application from its own E-mail Service sends NIPRNet-sourced email to the internet the Mission Owner needs to configure the cloud application to use the Enterprise Email Security Gateway EEMSG DISA publishes a guide called EEMSG Phase II Migration Guide The document is FOUO Please contact your DISA Enterprise Information Services Customer Management Executive CME representative to get a copy A list of CMEs is here http disa mil About media Files DISA Services Computing CMEContact pdf Keep in mind that a DNS PTR record is required to use EEMSG service 13 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 8 Storage Capacity Partitions and Backups Cloud computing when done right can provide substantial increase in storage agility Provided below are three disk space recommendations for those new to virtual servers 1 Deployment of a Microsoft Windows Server 2012 R2 into a virtual machine According to TechNet 7 the minimum space required in 32 GB However this does not take into consideration any additional roles or features you would have your server take on Additionally it is a best practice to have two separate partitions one for the Operating System OS and one for the Data In a starter set up recommend 40 - 50 GB for the OS space assuring that the virtual memory paging file has enough room to breathe and 50 GB for the Data If this is a web server you may want to bump up the Data to 75 - 100 GB Please note that to be in compliance with the Internet Information Services IIS 7 0 STIG rule V-3333 place the wwwroot or other web directories on the Data partition The web document home directory is accessed by multiple anonymous users when the web server is in production By locating the web document home directory on the same partition as the web server system file the risk for unauthorized access to these protected files is increased Additionally having the web document home directory path on the same drive as the system folders also increases the potential for a drive space exhaustion attack 2 Deployment of a SQL Server into a virtual machine According to MSDN 8 the minimum space required is 6 GB which is relatively small It is recommended to have the OS have 50 GB of space assuring that the virtual memory paging file has enough room to breathe and a separate partition with 50 GB of space for Data Please note in accordance with the Microsoft SQL Server 2012 Database Instance STIG rule V-40951 Install SQL Server software using directories separate from the OS and other application software library directories Relocate any directories or reinstall other application software that currently shares the DBMS software library directory to separate directories One last approach includes three separate partitions one for the OS one for the Data and one for the Audit Logs This simplifies locking down the auditing logs in compliance for protecting audit information from any type of unauthorized access in accordance with the Microsoft SQL Server 2012 Database Instance 7 8 https technet microsoft com en-us library dn303418 aspx https msdn microsoft com en-us library ms143506 aspx 14 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Security Technical Implementation Guide V-41016 This approach does not require a separate partition for audit logs but imagine the scenario in which your audit logs grow and you need more disk space The Mission Owner could easily swap out that partition without affecting the OS or Data This would benefit a web server as well 3 Deployment of a LINUX OS into a virtual machine There are many varieties of LINUX For this example let's consider Red Hat Linux and SUSE Linux Enterprise Server First Red Hat Linux9 the minimum storage requirement is 4 GB This is pretty small It is recommended to have 10 - 15 GB instead Please remember that the minimum specifications on the Red Hat site do not take into consideration the auditing requirements as described in the Red Hat Enterprise Linux 6 STIG The Red Hat Enterprise Linux 6 STIG requires the following partitions Partition home Rule V-38473 tmp V-38455 var V-38456 var log V-38463 var log audit V-38467 var www Optional Web Servers also recommend changing webroot to nondefault path From Web Server STIG V-3333 opt Optional Commercial Applications Author Recommendation Note The above does not mean the system needs 7 distinct volumes Multiple partitions can exist on one volume Table 4 Red Hat Linux Partitions 9 https access redhat com documentation enUS Red_Hat_Directory_Server 8 2 html Installation_Guide Installation_Guide-RHEL-Requirements html 15 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Secondly SUSE Linux Enterprise Server 10 the recommendation is 2 GB available disk space 8 5 GB for all patterns Again this is relatively small One common reason for choosing to deploy SUSE Enterprise Server is because Apache 2 2 MySQL 5 5 PHP 5 3 and Ruby 1 8 7 are installed It is recommended the OS have 15 - 20 GB of storage and the Data have 10 GB The Mission Owner should utilize YaST to configure the VM to have two partitions Then configure Apache 2 2 to store the data files on the separate mounted Data partition Remember to properly apply permissions to whatever you create IAW the STIG Now let's switch to another related topic - backups which is a Mission Owner's responsibility using IaaS In the planning stages the Mission Owner should think about the frequency of backing up the data There are multiple approaches available to achieve this One method is to create weekly images of all of the VMs This may be viewed as overkill Another approach is to take snapshots of specific volumes If the Mission Owner follows the process of separating OS from Data the OS snapshot may be monthly or right after a patch cycle completes and your Data would be more frequent To illustrate the importance of deliberate backup Rackspace in their Best Practices for Cloud Backup 11 defines a backup strategy according to three factors criticality size and data churn Several points are worth summarizing 10 11 o Criticality is the most important factor to consider when making backup decisions The more critical the file is to business operations the more often one should back this file up11 o Size is an important consideration if the speed of backups restores is important Large files take longer to backup and to restore It may be wise to backup large files less frequently11 o Data churn is the last variable to consider and perhaps the trickiest to handle Files that change often invalidate blocks that have been stored previously Depending on criticality it may still be wise to snapshot files with high data churn and backup those snapshots11 https www suse com products server technical-information http www rackspace com knowledge_center article best-practices-for-Cloud-backup 16 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 Back up less often files that have Lower Criticality High Data Churn Larger Size DISA Risk Management Executive Developed by DISA for DoD Back up more often files that have Higher Criticality Low Data Churn Smaller Size TIP Do not make decisions about backup frequency lightly If you try to backup or restore files more frequently than the backup engine can keep up with anomalous behavior may result 11 There is no wrong approach Please remember to document the process in the Site Security Plan which is required by Application Security and Development STIG 17 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 9 Achieving High Availability Regardless of the CSO there are specific mechanisms to achieve high availability in the Cloud The Mission Owner must design for a robust architecture Before going further it is important to understand that the Risk Management Framework RMF takes into consideration three security objectives 12 FIPS 199 for information and information systems Confidentiality C Integrity I and Availability A Under this method each of the three objectives is rated High H Moderate M or Low L for each information system An approach will differ if a system is rated as C M I M A H versus rated as C L I L A L The takeaway is to work with your ISSM and AO office in determining the information system's rating Let's consider five different failures that may affect the availability of a specific system application in the Cloud 1 Application Failure To illustrate SharePoint Server is running and the web server service fails One solution is to build in fault tolerance into the application and define behaviors for application or system errors This includes information that must be logged in the error logs Additionally do not forget test and evaluation of the Cloud information systems 2 Server Failure including misconfiguration One solution involves spreading the workload across multiple servers and utilizing a load balancer AWS calls this Elastic Load Balancing 13 and Azure calls it Traffic Manager 14 One issue is the frequency of data replication The Mission Owner must work with their stakeholders in determining the appropriate level of data replication 3 Data Center failure including zone failure Most CSOs offer multiple zones data in another data center One solution is to split the load into different zones AWS calls this Availability Zones 15 Azure calls these Regions 16 other CSOs may have different names but the concept is all the same 12 http csrc nist gov publications fips fips199 FIPS-PUB-199-final pdf http aws amazon com elasticloadbalancing 14 https azure microsoft com en-us documentation articles traffic-manager-overview 15 http docs aws amazon com AWSEC2 latest UserGuide using-regions-availability-zones html 16 http azure microsoft com en-us regions 13 18 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Example of AWS Availability Architecture 17 Example of Azure Region 18 4 Whole Cloud Failure It may be that a system is mission critical enough for example a RMF Rating of C M I M A H In this case the Mission Owner could place backup information into another CSO as described in section 5 12 of the Cloud Computing SRG 5 Network Failure There will be times of network congestion within the users' enclave There will also be Internet Congestion Mission Owners should develop appropriate plans of actions for such events TIP Regardless of what Availability techniques are used in the Cloud the Mission Owner must not forget to establish some sort of notification mechanism Some CSOs offer built-in HTTP Status Code 200 19 checks against a file on the web server There may be other notification mechanisms that check the health of the VM itself 17 http docs aws amazon com AWSEC2 latest UserGuide using-regions-availability-zones html http blogs msdn com b hanuk archive 2014 12 19 building-mission-critical-systems-using-Cloud-platformservices aspx 19 http www w3 org Protocols rfc2616 rfc2616-sec10 html 18 19 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 10 Bastion Host When implementing a Cloud environment Mission Owner should utilize as many Defense in Depth approaches as possible One of the least expensive security systems is a Bastion Host From Committee on National Security Systems CNSS Instruction No 4009 20 a Bastion Host is a special purpose computer on a network specifically designed and configured to withstand attacks The computer generally hosts a single application for example a proxy server and all other services are removed or limited to reduce the threat to the computer A cloud-based Bastion Host sole purpose is to provide administrative access to other VMs It is recommended that a box with 1 - 2 vCPUs and 4 GB of memory is available When not in use the Bastion Host should be turned off Additionally if using Active Directory and establishing a domain recommend that the Bastion Host is NOT a member of the domain Therefore if by chance the Bastion Host is compromised the attacker will not have direct access to the domain Lastly do not forget to STIG the Bastion Host and keep it patched 20 www ncsc gov publications policy docs CNSSI_4009 pdf 20 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD 11 Useful Tips Lessons Learned There are several things that are helpful in knowing before launching the Cloud environment 1 Regardless of what CSO is used for IaaS the CSP will offer a plethora of choices for instance types Do not get caught up in worrying about selecting the wrong type It is easy to change the instance type in the Cloud In most case the Mission Owner will get two choices 1 the ability to dynamically decrease or increase the instance size on the fly or 2 the ability to create an image of the instance to redeploy it in a different size In standing up the cloud environment the Mission Owner will likely change instance sizes multiple times Furthermore if the Mission Owner has a tight budget and has to choose between vCPU and Memory go with Memory 2 When deploying a web front end server it can be discovered by web crawlers like Google and Yahoo Upon discovery the web crawlers can hit the site hard and eventually bring the site down The remedy is the placement at the root site level of a robots txt file which deterred or deflected web crawlers For more information on how to build a robots txt including syntax and format please go here http tools seobook com robots-txt 3 Estimating bandwidth usage-based billing can be difficult There may be little basis for estimating the requisite bandwidth One project estimated 500 GB in traffic per month but soon realized it was closer to 2 - 5 TB per month To estimate for bandwidth utilization it is recommended a Mission Owner multiplies his or her initial estimate by 4 Since bandwidth is metered if a Mission Owner significantly overestimates the usage they will not be paying for it Recommend that the Mission Owner reviews bandwidth usage at least quarterly DISA welcomes Mission Owners and Industry Partners to submit lessons learned found during their Cloud implementations Please send a note of interest to the disa meade re mbx disa-commercial-cloud@mail mil 21 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Appendix A Terminology This Guide uses the following terminology Cloud Service Provider CSP A company that offers cloud computing service components specifically Infrastructure as a Service IaaS Software as a Service SaaS or Platform as a Service PaaS offerings Cloud Service Offering CSO A specific capability or set of capabilities offered for consumption These offers must have a FedRAMP approval and have a DoD Provisional Authorization PA The Federal Risk and Authorization Management Program FedRAMP A government-wide program that provides a standardized approach to security assessment authorization and continuous monitoring for Cloud products and services For more information go here https www fedramp gov Infrastructure as a Service IaaS 21 The capability provided to the consumer to provision processing storage networks and other fundamental computing resources where the consumer is able to deploy and run arbitrary software which can include operating systems and applications The consumer does not manage or control the underlying Cloud infrastructure but has control over operating systems storage and deployed applications and possibly limited control of select networking components e g host firewalls Platform as a Service PaaS 21 The capability provided to the consumer to deploy onto the Cloud infrastructure consumer-created or acquired applications created using programming languages libraries services and tools supported by the CSP The consumer does not manage or control the underlying Cloud infrastructure including network servers operating systems or storage but has control over the deployed applications and possibly configuration settings for the application-hosting environment Software as a Service SaaS 21 The capability provided to the consumer to use the CSP's applications running on a Cloud infrastructure The applications are accessible from various client devices through either a thin client interface such as a web browser e g web-based email or a program interface The consumer does not manage or control the underlying Cloud infrastructure including network servers operating systems storage or even individual application capabilities with the possible exception of limited user-specific application configuration settings 21 NIST Definition of Cloud Computing Special Publication 800-145 22 UNCLASSIFIED Best Practices Guide for DoD Cloud Mission Owners Aug 2015 DISA Risk Management Executive Developed by DISA for DoD Community Cloud22 Provisioned for exclusive use by a specific community of Mission Owners from organizations that have shared concerns e g mission security policy and compliance considerations It may be owned managed and operated by one or more of the organizations in the community a third party or some combination of them and it may exist on or off premises Private Cloud 22 Operated solely for a single Mission Owner whether managed internally or by a third-party and hosted on or off premises Private Clouds are usually virtualized Cloud data centers inside a Mission Owner's firewall or they may be private space dedicated to an organization within a CSP's data center In private Cloud computing access to the Cloud is limited to internal users Additionally in private Cloud computing users may still have to purchase the internal hardware and software implement and manage the solution and thus do not benefit from lower upfront capital costs and less hands-on management Of course these costs can still be mitigated somewhat by creating more efficient environments through virtualization - or by taking the off premises route to private Clouds by asking the CSP to provide dedicated resources for critical data or applications Public Cloud22 The delivery of Cloud services e g software applications over the Internet by a third-party provider to the general public It exists on the premises of the CSP and usually includes virtualization for more efficient deployment of shared resources Hybrid Cloud22 Any combination of external public CSOs and internal resources to create a solution Hybrid cloud computing implies a significant integration or coordination between the internal and external cloud environments It may exist on or off premises In the completely off-premises hybrid model a CSP can supply a shared virtual environment along with private dedicated data storage space all on the CSP's premises 22 Best Practices for Negotiating Cloud-Based Software Contracts http www esi mil download aspx id 4783 23 UNCLASSIFIED                     National Security Archive    Suite 701  Gelman Library  The George Washington University    2130 H Street  NW  Washington  D C  20037    Phone  202 994‐7000  Fax  202 994‐7005  nsarchiv@gwu edu